Process for producing colored coatings of glass



UNITED ST Serial August In the glass industry red coatings on glass res PATENT OFFICE PROCESS FOR PRODUCING COLORED COATINGS GLASS Norbert Kreidl, Reitendor! a/Tess, Czechoslovakia No Drawing. Application November 8, 1929,

3 Claims.

(lazuren) are mostly produced by means of copper salts, which first of all are burned on the glass and thereupon are burned again with re- 5 ducing agents such as sawdust,

charcoal, and

the like, whereby the copper salt is reduced and the red coating is formed.

The present invention depends on the fact that by using sulphide glasses, that is, glasses containing sulphides or colored with sulphides, especially black glasses, the second burning process may be avoided and thus colored coatings are directly obtainable on the glass by ing.

The process according a single burnto the invention, therefore, provides a new way of applying colored glass coatings uniformly,

sired places, on the surface.

fore, also enables any desired p produced.

or locally at any de- The process thereatterns to be and in Czechoslovakia What I claim is:

,1. Process for producing red colored coatings, patterns, or the like on glasses, comprising applying and then burning on sulphide glasses, compositions containing those copper compounds 00 which are reducible by sulphide glasses.

2. Process for producing red colored coatings, patterns, or the like on glasses, comprising applying and then burning on sulphide glasses those copper compounds which are reducible by sulphide glasses.

3. Process for producing red colored coatings, patterns, or the like on glasses, comprising applying and then burning on black sulphide glasses those copper compounds which are reducible by sulphide glasses.

NORBERT KREIDL. 

